Find all local extreme values of f(x)=−23x3+10x2−42x+70\displaystyle {f{{\left({x}\right)}}}=-\frac{{2}}{{3}}{x}^{{3}}+{10}{x}^{{2}}-{42}{x}+{70}.

The FIRST local extreme value, moving from left to right on the graph, is a at .

 

The SECOND extreme value, moving from left to right on the graph, is a at .

 

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